This picture shows three views of a large Maya culture
biface. It's made of heavily patinated Colha chert and
weighs 19.7 lbs. (8.9 kg). There is no evidence that it was
ever used for cutting or digging. Some of the surface flake
ridges are smoothed which might be the result of
transportation wear or some other form of handling. This
biface measures 32 1/2 inches (82.5cm) long, 5 7/8 inches
(15cm) wide and over 2 inches (5.1cm) thick.